University of Maryland Extension

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Blister Beetle - Flowers

There are 250 species of blister beetles in the U.S. The name blister refers to the chemical cantharidin in their bodies. This chemical will blister the skin if the beetle is crushed against it. The adult beetles are 1/2 to 3/4 inch long, slender and the elytra or wing covers soft and flexible. The...

Beetle Grubs/Root Feeding Insects - Flowers

Back to Aphids Grubs Are the larvae of beetles such as Japanese beetle, Green June beetle, May or June Beetle, Chafers, Oriental beetle and weevils (beetles with snouts), such as black vine weevil. Grubs are generally creamy colored with brown heads. Most beetle grubs have legs. Scarab beetle grubs...

Aphids - Flowers

Most aphids are small, soft-bodied insects, of various colors (green, yellow, orange, red, black or white), some may be covered with fluffy white wax. All aphids have long, slender mouthparts, which they use to suck out plant fluids. This feeding causes curling, distortion, or wilting of the leaves...

Wilt Diseases - Flowers

When fungi or bacteria enter the roots and stems of a plant and cause stunting, wilt and death by plugging the vascular system, this is called a "vascular wilt." Infected plants wilt and die. If you cut into the stem, the vascular tissues show discoloration as tan, reddish, or dark streaking...

White Mold - Flowers

When a plant or part of the plant (leaf, flower, fruit) rapidly collapses and dies this is called blight. Many bacteria, fungi, and viruses can cause blights. Most blights are favored by certain weather conditions, such as hot and humid or cool and moist White mold is caused by the fungus...

Viruses - Flowers, Vines

Impatiens necrotic spot virus Symptoms of virus infection include necrotic spots, abnormal dark green and light green mosaic and mottling of leaves, growth distortion, stunting, ring patterns or bumps on plant foliage, and abnormal flower coloration and formation. Plants may also be infected with...

Rust - Flowers and Vines

Rusty colored spots on the underneath of geranium leaves Symptoms of infection usually appear as light colored spots on the upper leaf surface followed by rusty colored areas of spores either on the upper or lower leaf surfaces (goldenrod and geranium). Rubbing these areas with a finger or onto a...

Root, Crown and Stem Rots - Flowers

Pachysandra suffering from root rot Root and crown infections will first appear as wilting or collapse of the plant. Early detection of infected plants includes scouting for plants that either wilt or collapse during periods of water stress. Chronically infected plants may be stunted or off color...

Voles - Groundcovers

Voles, also known as meadow mice, are very plentiful in many landscapes. They are often confused with a mole. However, unlike the mole, they feed on plant material and spend more time above ground. There are actually two species in Maryland: the meadow vole and the pine vole. Voles are active day...

Spider Mites - Flowers and Groundcovers

Yellowing due to a spider mite infestation Spider mites are very tiny plant pests that are related to spiders. They feed only on plants. The colors may be reddish or light green with two dark spots. They are about the size of a period on a page. Spider mites can be a problem all year indoors and...

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